diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9c5fcf1a12aaf0cbbefad3ccba1e54d1cdc73a31..c6cd6c3d4dcab0dced15490c85ee0d4b51e6022d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,9 @@
 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 
+if("${CMAKE_CURRENT_BINARY_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
+	message(FATAL_ERROR "In-source builds are blocked. Please build from a separate directory.")
+endif()
+
 # Set up CMAKE path
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")